Answers edited by HPN

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• How do you calculate the #arctan(0)#?
  
• What volume does 0.0250 mole #H_2# occupy at 0.821 atm pressure and 300 K?
  
• Steve has $3 more than twice as much as Tracy. Together they have $57. How much does each have?
  
• How do you use the factor theorem to determine whether x-3 is a factor of #p(x)=x^4-2x^3+4x-5#?